Final answer:
The value of s is 4.
Step-by-step explanation:
To find the value of s, we need to use the formula for the slope of a line, which is m = (y2 - y1) / (x2 - x1). Given that the line passes through the points (7,0) and (8,s), we can substitute these values into the formula to find the slope:
4 = (s - 0) / (8 - 7)
Now we can solve for s:
4 = s - 0
s = 4
Therefore, the value of s is 4.